Rear wiring type leakage protection plug

Abstract

The utility model relates to the technical field of electrical safety protection equipment, in particular to a rear wiring type leakage protection plug, which comprises an upper shell, a lower shell hermetically connected with the upper shell, a magnetic ring arranged inside the lower shell, an electric control board electrically connected with the magnetic ring, two copper inserts fixed on the lower shell and a power line electrically connected with the electric control board. The upper shell is divided into a first shell body and a second shell body which are detachably connected, and the position where the power line is connected with the electric control board is arranged below the second shell body. When the power line is installed and detached, only the second shell needs to be detached and replaced, the electric leakage protection plug is very convenient to use, and the electric leakage protection plug can be directly sold in a wiring mode and a wireless mode so as to meet the requirements of different customer masses. Therefore, the product can be transported and stored with a reduced volume, the cost is reduced, and the convenience of field wiring is provided at the same time. In addition, the plug is simple in structure, convenient to implement and beneficial to realizing automatic production of products.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical safety protection equipment, in particular to a rear-wiring type leakage protection plug. Background Art

[0002] With the increasing popularity of household appliances, people pay more and more attention to the use safety of household appliances. At present, many household appliances are equipped with leakage protectors at the input end of the power supply. The leakage protector is to detect the "residual current" in the "ground wire" loop. Its working principle is to simultaneously pass the two power supply wires (live wire and neutral wire) of the plug through the central hole of a special "zero-sequence current transformer". When the electrical appliance is normally powered on, the currents flowing through the live wire and the neutral wire are exactly equal. The current goes in and out, and there is no voltage output from the secondary coil of the current transformer. When there is a "residual current" in the "ground wire loop" (including the ground loop), the currents of the two power supply wires passing through the transformer are unbalanced, and a voltage signal proportional to the current will be generated at the output end of the "current transformer". As long as the voltage signal is large enough, this voltage signal will be amplified and processed by the integrated circuit on the dedicated PCB board, and then trigger the thyristor on the board to change from cutoff to conduction, so that the trip coil connected in series in this loop is powered on, thereby disconnecting the main circuit tripping device and protecting the personal safety that may be in contact with the power supply.

[0003] For traditional leakage protection plugs, they are sold with power supply wires and then directly sent to supporting manufacturers to be connected to electrical equipment. Since the overall packaging of the product becomes large and bulky after being equipped with power supply wires, the transportation cost is relatively high. In addition, for different electrical equipment, the required power supply wires are various, which also brings certain difficulties to the production of manufacturers of leakage protection devices, resulting in poor compatibility and inconvenience in use of the leakage protection plugs. Summary of the Utility Model

[0004] In order to solve the technical defects mentioned in the above background art, the purpose of the utility model is to provide a rear-wiring type leakage protection plug.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A rear-wiring type leakage protection plug, comprising an upper shell, a lower shell hermetically connected to the upper shell, a magnetic ring disposed inside the lower shell, an electronic control board electrically connected to the magnetic ring, two copper inserts fixed to the lower shell, and a power cord electrically connected to the electronic control board; the upper shell includes a first shell and a second shell detachably connected; the first shell is hermetically connected to one side of the lower shell, and the second shell is screw-connected to the other side of the lower shell; the magnetic ring is disposed below the second shell, and there is a gap between the electronic control board and the magnetic ring; one end of the power cord sequentially penetrates through the second shell and the gap and is fixedly connected to the electronic control board and is located below the second shell.

[0007] By adopting the above technical solution, the upper shell is divided into a first shell and a second shell that are detachably connected. The second shell is screw-connected to the other side of the lower shell. The position where the power cord is connected to the electronic control board is disposed below the second shell. When installing and disassembling the power cord, only the second shell needs to be disassembled and replaced, which is very convenient to use. It realizes a leakage protection plug that can be directly wired and sold wirelessly to meet the needs of different customer groups. Thereby, the product can also be transported and stored in a reduced volume, reducing costs, and at the same time providing the convenience of on-site wiring. In addition, the structure of this plug is simple and easy to implement, which is conducive to realizing the automated production of the product.

[0008] Further, a circular sealing plate is provided at one end of the second shell connected to the power cord. Two limiting grooves are provided inside the sealing plate. Each limiting groove correspondingly fixes one wire of the power cord, improving the sealing performance and having a better waterproof and dustproof effect.

[0009] Further, two limiting posts are provided inside the second shell. Threaded holes are provided on both of the two limiting posts. The lower shell and the second shell are threadedly connected through the two limiting posts. A convex block is provided between the two limiting posts. The length of the side of the convex block close to the lower shell is less than the length of the other side of the convex block, and there is a gap between one end of one side of the convex block and the corresponding limiting post to form the limiting groove. The structure is compact and the installation and disassembly are convenient.

[0010] Further, both ends of the other side of the convex block are hermetically connected to the two limiting posts. The height of the convex block is greater than the ring width of the sealing plate. The convex block and the sealing plate can further prevent dust and water, protect the internal structure, and have better sealing performance.

[0011] Further, a sealing cover is prominently provided at one end of the first housing connected to the second housing. The upper surface of the sealing cover is fixedly connected to the lower surface of the first housing, and the inner surface of the second housing is sealingly connected to the upper surface of the sealing cover, making the connection structure more compact and also dustproof and waterproof. The lower side of the sealing cover is connected to the upper surface of the electronic control board, and the position where the power cord is connected to the electronic control board is located outside the sealing cover, facilitating the installation and disassembly of the power cord.

[0012] Further, the sealing cover is arranged in a U-shaped structure, and the U-shaped groove of the sealing cover is used for installing the power cord. The height of the end of the upper surface of the end of the sealing cover away from the first housing is higher than the height of the end of the upper surface of the end where the sealing cover is connected to the first housing to form a sealing groove, and the end of the second housing is clamped in the sealing groove, improving the sealing performance between the first housing and the second housing and also enabling quick alignment and more rapid installation.

[0013] Further, clamping grooves are provided on both sides where the outer side wall of the sealing cover is connected to the inner side wall of the lower housing, and protruding clamping blocks are correspondingly arranged on the inner side wall of the lower housing, and the clamping blocks are clamped in the clamping grooves, improving the connection stability.

[0014] Further, an open receiving groove is provided on the upper surface of the seat body of the magnetic ring near one end close to the power cord to form the gap, and one end of the power cord passes through the receiving groove and is connected to the electronic control board, with a compact structure and more convenient installation and disassembly.

[0015] In summary, the beneficial effects of the present utility model are as follows:

[0016] In the present utility model, the upper housing is divided into a first housing and a second housing which are detachably connected. The second housing is screwed to the other side of the lower housing. The position where the power cord is connected to the electronic control board is arranged below the second housing. When installing and disassembling the power cord, only the second housing needs to be disassembled and replaced, which is very convenient to use. It realizes a leakage protection plug that can be directly wired and sold wirelessly to meet the needs of different customer groups. Thereby, the product can also be transported and stored in a reduced volume, reducing costs, and at the same time providing the convenience of on-site wiring. In addition, the structure of this plug is simple and easy to implement, which is beneficial to the automated production of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an embodiment of the rear-wired leakage protection plug of the present utility model.

[0018] Figure 2 is a schematic structural diagram of an embodiment of the second housing of the rear-wired leakage protection plug of the present utility model.

[0019] Figure 3 It is a schematic diagram of the internal assembly structure of an embodiment of the rear-wired leakage protection plug of the present utility model.

[0020] Figure 4 It is a schematic diagram of the structure of an embodiment of the first housing of the rear-wired leakage protection plug of the present utility model.

[0021] Figure 5 It is a schematic diagram of the structure of an embodiment of the lower housing of the rear-wired leakage protection plug of the present utility model.

[0022] Figure 6 It is a schematic diagram of the structure of an embodiment of the magnetic ring of the rear-wired leakage protection plug of the present utility model.

[0023] Explanation of the reference numerals in the figure:

[0024] 1. Rear-wired leakage protection plug; 2. First housing; 21. Sealing cover; 22. Sealing groove; 23. Card slot; 3. Second housing; 31. Sealing plate; 32. Limiting groove; 33. Limiting post; 34. Protrusion; 4. Lower housing; 41. Block; 5. Electric control board; 6. Copper insert; 7. Power cord; 8. Magnetic ring; 81. Accommodating groove. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art shall fall within the protection scope of the present utility model.

[0026] Those skilled in the art should understand that in the disclosure of the present utility model, the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present utility model.

[0027] In the description of the present utility model, if there are descriptions such as "several", its meaning is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the base number, above, below, within, etc. are understood as including the base number. If there are descriptions of first, second, third, etc., they are only used for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0028] The following will further elaborate on the embodiments of the present utility model in conjunction with the attached Figures 1-6 drawings.

[0029] A rear-wired leakage protection plug 1, as Figure 1 shown in Figure 2 and Figure 3 , includes an upper shell, a lower shell 4 hermetically connected to the upper shell, a magnetic ring 8 disposed inside the lower shell 4, an electronic control board 5 electrically connected to the magnetic ring 8, two copper inserts 6 fixed on the lower shell 4, and a power cord 7 electrically connected to the electronic control board 5. The upper shell includes a first shell 2 and a second shell 3 detachably connected. The first shell 2 is hermetically connected to one side of the lower shell 4, and the second shell 3 is screwed to the other side of the lower shell 4. The magnetic ring 8 is disposed below the second shell 3, and there is a gap between the electronic control board 5 and the magnetic ring 8. One end of the power cord 7 passes through the second shell 3 and the gap in sequence and is fixedly connected to the electronic control board 5 and is located below the second shell 3.

[0030] Among them, the upper shell is divided into a first shell 2 and a second shell 3 that are detachably connected. The second shell 3 is screwed to the other side of the lower shell 4. The position where the power cord 7 is connected to the electronic control board 5 is set below the second shell 3. When installing and disassembling the power cord 7, only the second shell 3 needs to be disassembled and replaced, which is very convenient to use. It realizes a leakage protection plug that can be directly wired and sold wirelessly to meet the needs of different customer groups. Thus, the product can also be transported and stored in a reduced volume, reducing costs, and at the same time providing the convenience of on-site wiring. In addition, the structure of this plug is simple and easy to implement, which is conducive to realizing the automated production of the product.

[0031] In this embodiment, please refer to Figure 2 and Figure 3 . One end of the second shell 3 connected to the power cord 7 is provided with an annular sealing plate 31. The inside of the sealing plate 31 is provided with two limiting grooves 32. Each limiting groove 32 correspondingly fixes one wire of the power cord 7, improving the sealing performance and having a better waterproof and dustproof effect. The lower shell 4 is correspondingly provided with an annular sealing plate 31 to be assembled with the sealing plate 31 at the second shell 3 to form a closed-loop seal.

[0032] Two limiting posts 33 are arranged inside the second housing 3, and both limiting posts 33 are provided with threaded holes, and the lower housing 4 is threadedly connected to the second housing 3 through the two limiting posts 33. A protrusion 34 is arranged between the two limiting posts 33, and the length of the side of the protrusion 34 close to the lower housing 4 is less than the length of the other side of the protrusion 34, and a gap is arranged between the end of one side of the protrusion 34 and the corresponding limiting post 33 to form a limiting groove 32, which has a compact structure and is easy to install and disassemble. Specifically, the ends of both ends of the protrusion 34 close to the side of the lower housing 4 are provided with gaps between the corresponding limiting posts 33.

[0033] Moreover, the two ends of the other side of the protrusion 34 are sealed with the two limiting columns 33, and the height of the protrusion 34 is greater than the ring width of the sealing plate 31. The protrusion 34 and the sealing plate 31 can be further dustproof and waterproof, protecting the internal structure and having better sealing performance.

[0034] In this embodiment, please refer to Figure 3 , Figure 4 A sealing cover 21 is protruding from one end where the first housing 2 is connected to the second housing 3. The upper surface of the sealing cover 21 is fixedly connected to the lower surface of the first housing 2, and the inner surface of the second housing 3 is sealed to the upper surface of the sealing cover 21. The connection structure is more compact and can also be dustproof and waterproof. The lower side of the sealing cover 21 is connected to the upper surface of the electric control board 5, and the position where the power cord 7 is connected to the electric control board 5 is located on the outside of the sealing cover 21, which is convenient for installing and removing the power cord 7.

[0035] The sealing cover 21 is set to a U-shaped structure, and the U-shaped groove of the sealing cover 21 is used to install the power cord 7. The end height of the upper surface of the end of the sealing cover 21 away from the first shell 2 is higher than the end height of the upper surface of the end of the sealing cover 21 connected to the first shell 2 to form a sealing groove 22, and the end of the second shell 3 is clamped in the sealing groove 22, which improves the sealing between the first shell 2 and the second shell 3, and can also achieve rapid alignment, and the installation is faster.

[0036] The outer wall of the sealing cover 21 is connected to the inner wall of the lower shell 4 on both sides with a slot 23, and the inner wall of the lower shell 4 is correspondingly provided with a protruding block 41, which is locked in the slot 23 to improve the stability of the connection.

[0037] Please refer to Figure 6 The upper surface of the seat of the magnetic ring 8 near one end of the power line 7 is provided with an open receiving groove 81 to form a gap, and one end of the electric control board 5 is provided above the receiving groove 81. One end of the power line 7 passes through the receiving groove 81 and is connected to the electric control board 5, which has a compact structure and is more convenient for installation and disassembly. Among them, the shape of the receiving groove 81 can be set corresponding to the U-shaped groove structure of the sealing cover 21.

[0038] Please refer to Figure 4 , Figure 5, the lower case 4 is provided with a clamping block 41 that is engaged with the clamping groove 23 of the first housing 2 when the cases are closed. After the second housing 3 is disassembled, the first housing 2 and the lower case 4 can still be tightly connected. The first housing 2, the second housing 3 and the lower case 4 are assembled to form a closed loop, and only the wiring parts of the electronic control board 5 and the magnetic ring 8 are exposed in the assembled state. The lower case 4 is provided with a special shape for assembling with the second housing 3, and is provided with a limiting post 33 for assembling with the lower case 4 and fixing with screws. Among them, the upper end of the clamping block 41 is provided with an inclined surface that inclines inward, which is convenient for clamping the clamping block 41 into the clamping groove 23 and improving the installation efficiency.

[0039] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same parts are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A rear-connection leakage protection plug (1), characterized in that: The invention comprises an upper shell, a lower shell (4) sealed with the upper shell, a magnetic ring (8) arranged inside the lower shell (4), an electric control board (5) electrically connected to the magnetic ring (8), two copper plugs (6) fixed on the lower shell (4), and a power line (7) electrically connected to the electric control board (5); the upper shell comprises a first shell (2) and a second shell (3) which are detachably connected; the first shell (2) is sealed with one side of the lower shell (4), and the second shell (3) is screwed with the other side of the lower shell (4); the magnetic ring (8) is arranged below the second shell (3), a gap is arranged between the electric control board (5) and the magnetic ring (8), one end of the power line (7) passes through the second shell (3) in sequence, the gap is fixedly connected to the electric control board (5), and is located below the second shell (3).

2. The rear-connection leakage protection plug (1) according to claim 1, characterized in that: An annular sealing plate (31) is provided at one end of the second shell (3) connected to the power cord (7), and two limiting grooves (32) are provided inside the sealing plate (31), and each limiting groove (32) corresponds to a wire that fixes the power cord (7).

3. The rear-connection leakage protection plug (1) according to claim 2, characterized in that: Two limiting columns (33) are arranged inside the second shell (3), and both of the limiting columns (33) are provided with threaded holes, and the lower shell (4) and the second shell (3) are threadedly connected via the two limiting columns (33); a protrusion (34) is arranged between the two limiting columns (33), and the length of one side of the protrusion (34) close to the lower shell (4) is smaller than the length of the other side of the protrusion (34), and a gap is arranged between the end of one side of the protrusion (34) and the corresponding limiting column (33) to form the limiting groove (32).

4. The rear-connection leakage protection plug (1) according to claim 3, characterized in that: The two ends of the other side of the protrusion (34) are sealed to the two limiting pillars (33), and the height of the protrusion (34) is greater than the ring width of the sealing plate (31).

5. The rear-connection leakage protection plug (1) according to claim 1, characterized in that: A sealing cover (21) is protruding from one end of the first shell (2) connected to the second shell (3); the upper surface of the sealing cover (21) is fixedly connected to the lower surface of the first shell (2); the inner surface of the second shell (3) is sealed to the upper surface of the sealing cover (21); the lower side of the sealing cover (21) is connected to the upper surface of the electric control board (5); the position where the power line (7) is connected to the electric control board (5) is located on the outside of the sealing cover (21).

6. The rear-connection leakage protection plug (1) according to claim 5, characterized in that: The sealing cover (21) is configured as a U-shaped structure, and the U-shaped groove of the sealing cover (21) is used to install the power cord (7); the end height of the upper surface of the end of the sealing cover (21) facing away from the first shell (2) is higher than the end height of the upper surface of the end of the sealing cover (21) connected to the first shell (2) to form a sealing groove (22), and the end of the second shell (3) is clamped in the sealing groove (22).

7. The rear-connection leakage protection plug (1) according to claim 6, characterized in that: Both sides where the outer wall of the sealing cover (21) is connected to the inner wall of the lower shell (4) are provided with card slots (23), and the inner wall of the lower shell (4) is correspondingly provided with a protruding card block (41), and the card block (41) is locked in the card slot (23).

8. The rear-connection leakage protection plug (1) according to claim 1, characterized in that: An open receiving groove (81) is provided on the upper surface of the seat of the magnetic ring (8) close to one end of the power line (7) to form the gap, and one end of the power line (7) passes through the receiving groove (81) and is connected to the electric control board (5).

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